The patent badge is an abbreviated version of the USPTO patent document. The patent badge does contain a link to the full patent document.
The patent badge is an abbreviated version of the USPTO patent document. The patent badge covers the following: Patent number, Date patent was issued, Date patent was filed, Title of the patent, Applicant, Inventor, Assignee, Attorney firm, Primary examiner, Assistant examiner, CPCs, and Abstract. The patent badge does contain a link to the full patent document (in Adobe Acrobat format, aka pdf). To download or print any patent click here.
Patent No.:
Date of Patent:
Apr. 22, 2008
Filed:
Aug. 20, 2004
Masayuki Yoneda, Tokyo, JP;
Jun Mizoguchi, Tokyo, JP;
Yasuhiro Kajio, Tokyo, JP;
Masaya Ishikawa, Tokyo, JP;
Youichi Azuma, Tokyo, JP;
Naohisa Tsuchiya, Tokyo, JP;
Masayuki Yoneda, Tokyo, JP;
Jun Mizoguchi, Tokyo, JP;
Yasuhiro Kajio, Tokyo, JP;
Masaya Ishikawa, Tokyo, JP;
Youichi Azuma, Tokyo, JP;
Naohisa Tsuchiya, Tokyo, JP;
Yamatake Corporation, Chiyoda-Ku, Tokyo, JP;
Abstract
The pressure sensor device has a laminated diaphragm () in which a strain resistance gauge is formed in a surface and a stopper member () including a concave portion forming a curved surface parallel to a surface formed by displacement of the diaphragm, the concave portion being disposed to face the diaphragm. Specifically, the concave portion of the stopper member is formed into a curved surface in which depth y at a distance x from the center of the diaphragm is expressed by a quartic function [y=pr(1−x/r)/64D] in relation to the operating pressure for protection against maximum pressure p when the diaphragm has a radius of r, a thickness of t, and a flexural rigidity of D.